('CID100102930', 1),D-Asparticacid b-tert-butyl ester
('CID100070855', 1),N-(Benzyloxycarbonyl)-D-asparticacid
ldiff: defaultdict(<type 'list'>, {'CID100102930': [19], 'CID100070855': [22]})
f1: [19]
f2: [22]
c1: Counter({19: 1})
c2: Counter({22: 1})
The chosen was ... CID100102930